Clean up code, refactor parsing slightly
Clean up code, refactor parsing slightly

 - Change document to docBody because it's really only one part
   of the whole document structure, including metadata and notes

 - Refactor eop parser to return the tag rather than the empty
   space. Not sure if there is an advantage one way or the other.

 - Delete deprecated code because the corresponding parsers above
   have very much surpassed the old String-based versions.

R-Morgan/NGramCrackers